I have a 1973 AMF Harley Davidson (Aermacchi) 350 in my shop right now. It belongs to an airplane customers friend. He brought it in with no spark after acquiring from his father who had bought it new then at some point parked it after only putting about 2000 miles on it. I put a new condensor in it, cleaned the points, put a new spark plug in it, and cleaned the tank/carb. I also tore the switches apart and cleaned them up. Runs great and he is picking it up tonight.
I cleaned it up a little, but he did not want to pay me for anything more than getting it running. (I would love to detail this thing out, but he does not want to pay for nor would he appreciate my level of detail
)
Here is a link to wiring diagrams I found on-line.
http://www.sunnymeadcycles.com/files/H-D_Aermacchi_wiring.pdf
